Q: How much electricity do new windows save?

Does replacing all the windows in a house result in a big energy savings or just a modest one?

I live in Baltimore, Maryland, where it is muggy in the summer and cold in the winter. We use a good amount of air in the hot months and pretty heavy amount of heat in the cold ones. For your reference, the house is ~2,000 sq ft and two stories with a finished basement (heat and air go in there too, obviously). We would definitely love to make the house more "green friendly". And, replacing the windows is one of the moves that seems to make sense; however, it isn't exactly cheap to replace all the windows in the house. We would love to know how this improvement stacks up on both the green scale and the dollar savings scale. Thanks.

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